Click Here to Read: The Goldwater rule: why commenting on mental health from a distance is unhelpful: Is it okay to speculatively diagnose public figures like Trump? No, says the Goldwater rule – and recent challenges to it could set worrying precedents by Nick Davis on the Guardian website on July 28, 2017.

Psychologists once claimed that United States Senator and nominee for president, Barry Goldwater, was psychologically unfit to be president. Photograph: William Lovelace/Getty Images